最新三年级数学下册-口算除法练习课教案-人教新课标版

观察算式你发现了什么？计算出结果，你又发现了什么？

（除数不变，被除数扩大或缩小几倍，商就扩大或缩小相同的倍数。）

（二）课堂达标

1.练习三第4题

400÷4= 240÷4= 5400÷9=

300÷5= 3600÷6= 420÷6=

240÷8= 630÷7= 360÷9=

分组进行计算，找学生说算法。

2.比一比

400÷5 86 720÷9 90 300÷6 49

640÷8 80360÷4 100 360÷9 50

分组计算，汇报结果。

3.估一估得多少

94÷9≈141÷2≈479÷6≈

177÷3≈138÷7≈358÷4≈

（四）提高练习

1.公园运来80盆花，准备摆在2个花坛里。平均每个花坛摆多少盆花？如果摆在4个花坛里呢？自由读题，分析题意，独立解答。

2.在一个除法算式里，被除数是除数的10倍，是商的7倍，请写出这个除法算式。

三、课堂小结

同学们今天做得都很棒，那还记得学到了什么吗？大家写下来吧！

四、自主检测、评价完善

1.小兔分萝卜。

2.填空。

（1）420里有（）个十，42个十除以2等于（）个十，也就是（）。

（2）560里有（）个十，56个十除以 8等于（）个十，也就是（）。

（3）7除35个百得（）个百，也就是（）。

（4）9除54个千得（）个千，也就是（）。

3.算一算。

4.用你喜欢的方法估一估。

5.在里填“＞”、“＜”或“=”。

320÷830×2 2800÷41600÷4 480÷260×4 640÷24×8

250×0305×0 8100÷940×9

6.从3500里连续减去7个同样的数，正好得0，这个数是多少？

7.小明家四个月用电240度，小明家平均每月用电多少度？

板书设计：

口算除法的练习

532÷9≈60 找规律：

（540） 16÷2=

160÷2=

1600÷2=

1 I’ve just eaten it. 我刚才把它吃光了。

just可用于完成时态中，置于动词与助动词之间，意为“刚刚”

我刚刚做完家庭作业。I’ve just finished my homework.

我刚刚给我的笔友写了一封信。I’ve just written a letter to my pen friend.

just now刚才，相当于a moment ago,用于一般过去时，通常位于句首和句末。

刚才老师进教室了。The teacher entered the classroom just now.

2 You’ve changed, too. You used to be so kind to me.你也变了。你过去对我那么好。used to do sth 过去常常做某事（=often did sth in the past)

过去我们常在一起打牌，下象棋。We used to play cards and Chinese chess together. 我妈妈曾经是一位老师。My mother used to be a teacher.

这男孩过去常常放学后打篮球。The boy used to play basketball after school.

它的否定形式有两种：didn’t use to/used not to

used to be 曾经是

练习：

I. 首字母填空

1.My daughter studied very hard in the p .

2.I’m afraid I can’t help you at p.

3.Great changes have taken place in Taizhou s 1949.

4.My father often go to work by u .

5.At the fashion show, people wore clothes from different t .

II. 用所给词的正确形式填空

1.Tom has two (bowl) of rice for lunch.

2.Linda didn’t want(listen)to the music again.

3.We have meals three (time) a day.

4.There （be）some old houses near the park in the past.

5.It is dangerous （play ) with fire.

III. 请从各题后所给的A, B, C, D四个选项中选出最佳答案。

1. I _____ my bowl on the table a few minutes ago, but I can’t find it now.

A. see

B. have seen

C. saw

D. am seeing

2. —Why did you drink my juice? — _______ I was very thirsty.

A. For

B. Because

C. If

D. So

3. The twins are over there. Lucy is playing _____ volleyball. Lily is playing ______ Mimi, her cat.

A. 不填; 不填

B. with; with

C. 不填; with

D. with; 不填

4. He _____ a lot over the years. Now he is polite and kind.

A. changed

B. has changed

C. is changing

D. changes

5. The underground has been in use in the city _____ 2012.

A. since

B. on

C. for

D. at

6. My home isn’t far from school, so I ___ to school every day.

A. drive a car

B. take a bus

C. ride a bike

D. take a plane

7. — ______ is Simon? — He is watering flowers in the garden.

A. What

B. How

C. When

D. Where

8. We can go to Shanghai by _______. It is faster and can save more time.

A. plane

B. train

C. underground

D. coach